Low-level arch entries often call notify_die, and it's easy for arch
code to fail to exit an RCU quiescent state first. Assert that
we're not quiescent in notify_die.
Signed-off-by: Andy Lutomirski <l...@kernel.org>
---
kernel/notifier.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/notifier.c b/kernel/notifier.c
index ae9fc7cc360e..980e4330fb59 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -544,6 +544,8 @@ int notrace notify_die(enum die_val val, const char *str,
.signr = sig,
};
+ rcu_lockdep_assert(rcu_is_watching(),
+ "notify_die called but RCU thinks we're quiescent");
return atomic_notifier_call_chain(&die_chain, val, &args);
}
NOKPROBE_SYMBOL(notify_die);
--
2.4.2
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